Help a 4Runner owner?

Hey Guys,
Wanted to see if anyone on TW could help me out with something. A guy on T4R.org posted that he installed some front springs from a 1st gen Tacoma on his 3rd gen 4Runner and it really improved the ride. I've tried searching different sites that sell OEM Toyota parts, but keep coming up with several different part numbers. He bought them used, and the only info he has is that they came from a 2000 4WD. Do any of you know if there are different springs (part numbers) for different trim levels/engine types? If not, do you know a part number for those springs? Not interested in a lift or off-road performance, just looking to improve the ride on my daily driver.
Any info would be greatly appreciated.